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Effect of fluorine and cerium substitutions on the properties of the Tl2Ba2CaCu1.98Fe0.02O8 superconductor

✍ Scribed by A.I. Akimov; V. Ksenofontov; S.A. Lebedev; T.M. Tkachenka

Publisher: Elsevier Science
Year: 2006
Tongue: English
Weight: 209 KB
Volume: 443
Category: Article
ISSN: 0921-4534
DOI: 10.1016/j.physc.2006.04.091

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✦ Synopsis

Fluorine and cerium substituted Tl-2212 high-T c superconductors were produced. X-ray diffraction, Mossbauer effect method, temperature measuring of the resistances and a.c. susceptibilities for all Tl 2 Ba 2 Ca 1Ày Ce y Cu 1.98 Fe 0.02 O 8Àx/2 F x (0 6 x 6 0.2 and 0 6 y 6 0.1) were applied. It was found that the cerium admixture does not affect significantly the Tl-2212 superconductor properties. Fluorine admixture alone appreciably affects the value of superconducting transition temperature. The biggest increase in T c is 10 K and is realised for x = 0.10-0.20. Substituting admixtures are not clearly exhibited in Mossbauer parameters, i.e. do not influence Fe-O bonding tangibly.

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